Organizing my reading list in Mendeley
Photo Credit: Courtesy of 3DStockPhoto ( image)

One option would be to create a tags P1, P2, P3, P4 ... and assign "rating" to articles how much priority they have. Tags could be updated as priority changes.

(similar system could be used with Delicious.com tags to websites)

Tags are more flexible then folders. Mainly - Multiple membership in more than one tags